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Aqua (Water) — CIR Expert Panel Safety Assessment: The CIR Expert Panel concludes that water (aqua) is safe as used in cosmetic formulations.

CTPA Ingredient Library — Aqua (Water): Water is the most commonly used cosmetic ingredient and is listed as safe by the CTPA with no restrictions on use.

Methylpropanediol — CIR Expert Panel Safety Assessment: The CIR Expert Panel reviewed methylpropanediol and found it safe for use in cosmetic formulations at current concentrations.

CTPA Ingredient Library — Methylpropanediol: CTPA classifies methylpropanediol as a skin-conditioning humectant and solvent with a good safety profile, suitable for a wide range of cosmetic formulations.

Tromethamine — CIR Expert Panel Safety Assessment: The CIR Expert Panel determined that tromethamine (trometamine) is safe as used in cosmetic products as a pH adjuster and buffering agent.

CTPA Ingredient Library — Tromethamine: CTPA lists tromethamine as a safe pH adjuster and buffering agent with an established safety record in cosmetic formulations.

CIR Safety Assessment of Alpha Hydroxy Acids as Used in Cosmetics: The CIR Expert Panel reviewed lactic acid as part of its AHA assessment. It is safe as a pH adjuster and gentle exfoliant. At active exfoliant concentrations, the Panel recommended sun protection advisories due to increased photosensitivity potential.

CTPA Ingredient Library — Lactic Acid: CTPA lists lactic acid as a safe alpha hydroxy acid used as a pH adjuster and skin-conditioning agent. At higher active concentrations, CTPA advises labelling for potential increased sun sensitivity, consistent with EU Cosmetics Regulation requirements for AHA products.

CIR Safety Assessment of SD Alcohols as Used in Cosmetics: The CIR Expert Panel concluded denatured alcohol (SD alcohol/Alcohol Denat.) is safe as used in cosmetics as a solvent and antimicrobial agent. At concentrations above 20–30% it may cause dryness or irritation with repeated use, but is considered safe at concentrations typically found in toners and other leave-on products.

CTPA Ingredient Library — Alcohol Denat.: CTPA lists alcohol denat. (denatured ethanol) as a permitted cosmetic solvent and preservative. It provides a quick-drying, lightweight finish in cosmetic formulations. High concentrations in leave-on products may cause dryness or barrier disruption with frequent use.

CIR Safety Assessment of 1,2-Hexanediol as Used in Cosmetics: The CIR Expert Panel found 1,2-hexanediol safe as used in cosmetics. It functions as a humectant and antimicrobial preservative booster, enhancing the efficacy of other preservatives. No significant dermal irritation or sensitisation was identified at concentrations used in cosmetic formulations.

CTPA Ingredient Library — 1,2-Hexanediol: CTPA lists 1,2-hexanediol as a safe humectant and preservative booster used in cosmetics. It is considered non-irritating at concentrations typically found in leave-on and rinse-off formulations and is widely used as a paraben-free preservation system component.

CTPA Ingredient Library — 1,2-Hexanediol: CTPA classifies 1,2-hexanediol as a safe skin-conditioning agent and preservative enhancer, widely used in cosmetic formulations at concentrations up to 3%.

CIR Safety Assessment of Panthenol as Used in Cosmetics: The CIR Expert Panel found panthenol (provitamin B5) safe as used in cosmetic formulations. It functions as a humectant and skin-conditioning agent, improving skin hydration and supporting barrier function, with no significant irritation or sensitisation concerns.

CTPA Ingredient Library — Panthenol: CTPA lists panthenol as a safe humectant and skin-conditioning agent. As provitamin B5, it supports healthy skin cell metabolism. It is well tolerated and considered safe for sensitive skin.

Glycereth-26 — CIR Expert Panel Safety Assessment: The CIR Expert Panel concluded that glycereth-26 is safe as used in cosmetic formulations based on available safety data.

CTPA Ingredient Library — Glycereth-26: CTPA lists glycereth-26 as a safe skin-conditioning agent and emollient with a well-established safety profile in leave-on and rinse-off formulations.

FDA OTC Monograph — Salicylic Acid Acne Products: Salicylic acid is approved as an OTC active ingredient for acne treatment at 0.5-2% concentrations. It functions as a keratolytic agent, promoting shedding of the outer skin layer and unclogging pores.

Korean MFDS Salicylic Acid Use Standards in Cosmetics: Korean MFDS restricts salicylic acid to a maximum of 0.5% in rinse-off cosmetics and 2% in leave-on products for acne. Products must include a warning to avoid use during pregnancy and to use sun protection.

CTPA Ingredient Library — Ammonium Acryloyldimethyltaurate/VP Copolymer: CTPA lists this polymer as a safe film-forming thickening agent. It is not absorbed into the skin and poses no systemic risk.

CTPA Ingredient Library — Polymers and Film-Formers: Synthetic copolymers used as thickeners and stabilisers in cosmetics are considered safe by CTPA; they remain on the skin surface and are not absorbed.

Betaine — CIR Expert Panel Safety Assessment: The CIR Expert Panel found betaine safe as used in cosmetics; it is well tolerated across all skin types with no significant adverse effects reported.

CTPA Ingredient Library — Betaine: CTPA recognises betaine as a well-established skin-conditioning agent and humectant with a strong safety profile, suitable for sensitive skin formulations.

CTPA Ingredient Library — Trehalose: CTPA classifies trehalose as a safe skin-conditioning and humectant ingredient with excellent tolerability, including for sensitive and compromised skin.

CTPA Ingredient Library — Polyglyceryl-10 Laurate: CTPA lists polyglyceryl esters including polyglyceryl-10 laurate as safe, biodegradable emulsifiers with a low sensitisation potential, widely used in rinse-off and leave-on products.

CIR Safety Assessment of Ethylhexylglycerin as Used in Cosmetics: The CIR Expert Panel found ethylhexylglycerin safe as used in cosmetics. It functions as a skin-conditioning agent and preservative booster enhancing the efficacy of other preservatives. No significant irritation or sensitisation was identified at cosmetic concentrations.

CTPA Ingredient Library — Ethylhexylglycerin: CTPA lists ethylhexylglycerin as a safe skin-conditioning agent and preservative enhancer. It is used in cosmetics to improve formula feel and boost preservation systems, and is considered non-irritating for most skin types.

FDA GRAS Database — Glycerin: Glycerin (glycerol) is affirmed as Generally Recognized As Safe (GRAS) by the FDA. As a cosmetic ingredient, it is one of the most widely used and well-tolerated humectants, drawing moisture from the environment to the outer layers of the skin.

FDA OTC Skin Protectant Active Ingredient — Allantoin: The FDA recognises allantoin as a safe and effective OTC skin protectant active ingredient at concentrations of 0.5–2.0%. It soothes and protects irritated skin and helps relieve minor skin irritation from chapping, chafing, and wind.

CTPA Ingredient Library — Allantoin: CTPA lists allantoin as a safe, soothing skin-conditioning agent with a long history of safe use as a skin protectant. It is well tolerated by sensitive and reactive skin types.

CTPA Ingredient Library — Polyglyceryl-10 Myristate: CTPA recognises polyglyceryl-10 myristate as a safe skin-conditioning emulsifier with very low irritation and sensitisation potential.

Disodium EDTA — CIR Expert Panel Safety Assessment: The CIR Expert Panel concluded that disodium EDTA is safe as used in cosmetic formulations. The concentrations typically used (0.01–0.1%) are well within safe limits.

CTPA Ingredient Library — Disodium EDTA: CTPA lists disodium EDTA as a safe chelating agent with a well-established safety record in cosmetics; it enhances preservative systems and formula stability.

Butylene Glycol — CIR Expert Panel Safety Assessment: The CIR Expert Panel concluded that butylene glycol is safe as used in cosmetic formulations; it is a well-tolerated humectant and solvent.

CTPA Ingredient Library — Butylene Glycol: CTPA classifies butylene glycol as a safe skin-conditioning humectant and solvent with a strong tolerability record across skin types including sensitive skin.

FDA Briefing on Hyaluronic Acid in Topical Formulations: Sodium hyaluronate is generally recognized as safe (GRAS) as a cosmetic ingredient. It functions as an effective humectant and skin-conditioning agent suitable for all skin types.

Korean MFDS — Functional Cosmetic Ingredient Guidelines: Betaine Salicylate: The Korean Ministry of Food and Drug Safety (MFDS) regulates betaine salicylate as a functional cosmetic ingredient with recognised pore-minimising and exfoliating activity, subject to concentration limits.

CTPA Ingredient Library — Betaine Salicylate: CTPA recognises betaine salicylate as an exfoliating skin-conditioning agent; safety profile supports use in rinse-off and leave-on products within regulated concentration limits.

CTPA Ingredient Library — Citrus Aurantium Dulcis (Orange) Peel Oil: CTPA flags citrus peel oils as potential sensitisers due to their limonene and linalool content, both of which are regulated fragrance allergens under EU Cosmetics Regulation. Patch testing is recommended for sensitive individuals.

CTPA Ingredient Library — Citrus Limon (Lemon) Peel Oil: CTPA classifies lemon peel oil as a potential phototoxic and sensitising ingredient. It is recommended for use only in rinse-off products or in conjunction with adequate sun protection in leave-on formulations.

CTPA Ingredient Library — Citrus Grandis (Grapefruit) Peel Oil: CTPA advises caution for grapefruit peel oil in leave-on products due to phototoxicity risk. It is considered safe in rinse-off formulations at typical use concentrations.

CTPA Ingredient Library — Citrus Aurantium Bergamia (Bergamot) Fruit Oil: CTPA recommends bergapten-free (FCF) bergamot oil for leave-on cosmetic formulations. Non-FCF bergamot oil is considered unsafe in leave-on products due to phototoxicity risk.

Korean MFDS — Phototoxic Fragrance Ingredient Guidelines: The Korean MFDS restricts phototoxic fragrance ingredients including bergamot oil containing bergapten in leave-on cosmetic formulations under Korean functional cosmetics regulations.

CTPA Ingredient Library — Rosmarinus Officinalis (Rosemary) Leaf Oil: CTPA lists rosemary leaf oil as a fragrance and antioxidant ingredient. It is considered safe at typical use concentrations but is flagged as a potential sensitiser; patch testing is recommended for sensitive individuals.

CTPA Ingredient Library — Eucalyptus Globulus Leaf Oil: CTPA flags eucalyptus oil as a potential irritant and sensitiser at higher concentrations. It is considered safe at low concentrations in adult cosmetic formulations but should be avoided in products intended for use around the faces of young children.

CTPA Ingredient Library — Lavandula Angustifolia (Lavender) Oil: CTPA notes that linalool and linalyl acetate present in lavender oil must be declared per EU Cosmetics Regulation when present above threshold concentrations. Lavender oil is considered safe at typical use levels in cosmetics.

FDA Fragrance Allergen Disclosure — Linalool: The FDA has noted linalool as a fragrance allergen under consideration for mandatory disclosure in US cosmetics, reflecting its potential to cause skin sensitisation in susceptible individuals.

CTPA Ingredient Library — Vitis Vinifera (Grape) Fruit Extract: CTPA lists grape fruit extract as a well-tolerated botanical skin-conditioning and antioxidant ingredient with no significant safety concerns identified at cosmetic use concentrations.

CTPA Ingredient Library — Citrus Aurantifolia (Lime) Fruit Extract: CTPA classifies lime fruit extract as safe as used in cosmetics; the same photosensitivity precautions that apply to other citrus extracts apply at higher concentrations in leave-on formulations.

CTPA Ingredient Library — Citrus Limon (Lemon) Fruit Extract: CTPA lists lemon fruit extract as safe for cosmetic use; unlike lemon peel oil, it does not carry the same phototoxicity risk, though photosensitivity precautions remain relevant at higher concentrations.

CTPA Ingredient Library — Pyrus Malus (Apple) Fruit Extract: CTPA classifies apple fruit extract as a safe skin-conditioning botanical; its gentle AHA content is well tolerated at cosmetic use concentrations.

CTPA Ingredient Library — Citrus Aurantium Dulcis (Orange) Fruit Extract: CTPA lists orange fruit extract as a safe skin-conditioning and antioxidant ingredient; unlike the peel oil, the fruit extract does not carry phototoxicity or significant sensitisation risk at cosmetic use concentrations.

Ethylhexanediol — CIR Expert Panel Safety Assessment: The CIR Expert Panel found ethylhexanediol safe as used in cosmetic formulations as a humectant and preservative booster at concentrations typically employed in cosmetics.

Korean MFDS — Functional Cosmetic Ingredients: Centella Asiatica: Centella asiatica extract is recognized by the Korean MFDS as a beneficial cosmetic active ingredient. Its active constituents (asiaticoside, asiatic acid, madecassic acid) support collagen biosynthesis and skin wound healing.

CTPA Ingredient Library — Salix Alba (Willow) Bark Extract: CTPA lists willow bark extract as a safe skin-conditioning and exfoliating botanical at cosmetic use concentrations. It is considered a natural BHA precursor with a gentler profile than synthetic salicylic acid.

CTPA Ingredient Library — Origanum Vulgare Leaf Extract: CTPA classifies origanum vulgare leaf extract as safe as used in cosmetic formulations; its antimicrobial and antioxidant properties are well documented at cosmetic concentrations.

Korean MFDS — Chamaecyparis Obtusa in Cosmetic Formulations: Chamaecyparis obtusa (Hinoki Cypress) extract is a well-established ingredient in Korean and Japanese cosmetic traditions, recognised by the Korean MFDS as safe for cosmetic use with documented antimicrobial and soothing properties.

CTPA Ingredient Library — Ferment Filtrates and Postbiotics: CTPA recognises ferment filtrates and postbiotic extracts as safe skin-conditioning actives; they are well tolerated across skin types and are not associated with significant adverse effects in cosmetic use.

Korean MFDS — Fermented Ingredient Guidelines for Cosmetics: The Korean MFDS recognises fermented botanical extracts, including soybean ferment, as safe and effective skin-conditioning actives in cosmetic formulations, with supporting data for barrier-strengthening and brightening claims.

CTPA Ingredient Library — Cinnamaldehyde (Fragrance Allergen): CTPA lists cinnamaldehyde (present in cinnamon bark extract) as a regulated fragrance allergen under EU Cosmetics Regulation Annex III. Disclosure is mandatory above threshold concentrations; those with fragrance sensitivity or sensitive skin should avoid products containing this ingredient.

Korean MFDS — Caution Ingredients in Leave-On Cosmetics: The Korean MFDS lists cinnamon bark-derived ingredients as caution ingredients in leave-on cosmetic formulations due to the sensitisation risk associated with cinnamaldehyde content.

CTPA Ingredient Library — Scutellaria Baicalensis Root Extract: CTPA classifies Scutellaria baicalensis root extract as a well-tolerated botanical with documented anti-inflammatory and antioxidant properties; no significant safety concerns have been identified at cosmetic use concentrations.

Korean MFDS — Botanical Ingredients in Functional Cosmetics: Scutellaria baicalensis root extract is widely used in Korean functional cosmetics and is recognised by the Korean MFDS as safe, with supporting evidence for soothing and antioxidant claims in topical formulations.

CTPA Ingredient Library — Portulaca Oleracea Extract: CTPA lists portulaca oleracea extract as a well-tolerated skin-conditioning botanical with documented soothing and antioxidant properties; no significant safety concerns at cosmetic use concentrations.

CTPA Ingredient Library — Oenothera Biennis (Evening Primrose) Extract: CTPA recognises evening primrose extract as a well-documented, safe skin-conditioning botanical rich in gamma-linolenic acid (GLA); it is well tolerated across all skin types including sensitive and compromised skin.

CTPA Ingredient Library — Pinus Palustris Leaf Extract: CTPA classifies pine leaf extracts as safe skin-conditioning botanicals with antioxidant and antimicrobial properties; no significant safety concerns have been identified at cosmetic use concentrations.

Korean MFDS — Ulmus Davidiana Root Extract in Cosmetics: Ulmus davidiana root extract is a recognised botanical ingredient in Korean cosmetics, listed by the Korean MFDS as safe for use in topical formulations with documented soothing and skin-conditioning properties.

Korean MFDS — Pueraria Lobata Root Extract in Functional Cosmetics: Pueraria lobata (kudzu) root extract is registered as a safe botanical ingredient in Korean cosmetics under Korean MFDS guidelines, with recognised antioxidant and brightening activity in topical formulations.

CTPA Ingredient Library — Pueraria Lobata Root Extract: CTPA considers pueraria lobata root extract safe for use in cosmetics; it is well tolerated and its isoflavone content poses no significant safety concern given the limited systemic absorption from topical application.

CTPA Ingredient Library — Limonene (Regulated Fragrance Allergen): CTPA lists limonene as a regulated fragrance allergen under EU Cosmetics Regulation Annex III. Mandatory disclosure on the ingredient label is required above defined threshold concentrations. It is considered safe at cosmetic use levels but is a known sensitiser in susceptible individuals.

FDA Fragrance Allergen Disclosure Review — Limonene: The FDA has identified limonene as a fragrance allergen under consideration for mandatory disclosure requirements in US cosmetics, consistent with its classification as a sensitiser in European and international regulatory frameworks.